ABB REQ650 - Setting of Voltage Channels and Examples

Transformer
protection
Setting of current input:
Set parameter
CTStarPoint with
Transformer as
reference object.
Correct setting is
"ToObject"
ForwardReverse
Definition of direction
for directional
functions
Line protection
Setting of current input:
Set parameter
CTStarPoint with
Transformer as
reference object.
Correct setting is
"FromObject"
Setting of current input:
Set parameter
CTStarPoint with
Line as
reference object.
Correct setting is
"ToObject"
IED
IED
IEC11000021_1_en.vsd
IEC11000021 V2 EN
Figure 24: Example how to set CTStarPoint parameters in the IED
This example is similar to example 1, but the power transformer is feeding just one
line; both line protection IED and transformer protection IED use the same CT. The
CT direction is set with different reference objects for the two IEDs though it is the
same current from the same CT that is feeding the two IEDs. With these settings the
directional functions of the line protection shall be set to Forward to look towards the
line.
4.2.3.3 Examples on how to connect, configure and set CT inputs for most
commonly used CT connections
Figure
25 defines the marking of current transformer terminals commonly used
around the world:
In the SMAI function block, you have to set if the SMAI block is
measuring current or voltage. This is done with the parameter:
AnalogInputType: Current/voltage. The ConnectionType: phase -
phase/phase-earth and GlobalBaseSel.
1MRK 505 291-UEN A Section 4
Analog inputs
65
Application manual